Femme Fatale Tour: December 7, 2011

It's safe to say Britney Spears' Femme Fatale is one of her best albums yet for booty-shaking fun, and by the looks of her hot bod in this flirty corset costume, she can pull off just about any body-baring outfit! To get in tip-top shape for the tour, the sexy singer ramped up her workouts to include 90 minutes in the gym with former trainer Derek DeGrazio, followed by five hours of dance rehearsals and a strict 1,500-calorie-a-day diet. “She looks amazing,” DeGrazio told People. "You can see the tone in her muscles—her arms, legs, and abs."

Billboard Music Awards: May 22, 2011

Britney opened the 2011Billboard Music Awards in this figure-flaunting, leather, bondage-style bodysuit that left little to the imagination. The blonde beauty’s performance was so steamy, she even finished it off with an on-stage kiss with Rihanna. Spears' vigorous workouts were obviously paying off; she looked incredibly toned in the dominatrix ensemble. "I think that you should be proud of the body that God has given you. Take care of it by eating right and exercising, but be proud of it and of who you are," she's said.

Bill Graham Civic Auditorium: March 27, 2011

There's nothing better than a nude sequin bodysuit, and Britney definitely wears it like the best of them! Case in point: The super sexy ensemble she sported during a performance in 2011. Clearly the sultry singer has confidence. “To me, someone who is sexy is someone with confidence, who carries themselves properly and is comfortable in their own skin,” Spears has said.

Good Morning America: December 2, 2008

Britney certainly woke up America in a memorable way with this black crop top and low-riding leather pants that showed off her awesomely toned abs. But it's no wonder she looked so amazing; the singer had been working her butt off (literally) in preparation for her much-anticipated comeback. And even though Spears says she used to be obsessed with working out, she admits that going to the gym "isn't fun… so to do it every day would be horrible. Three days a week is cool, even two. It makes me feel good and feel like I’ve done something."

Bambi Awards: November 27, 2008

Britney absolutely sizzled in this skimpy ringleader-inspired costume, looking every bit the pop princess. How did she lose the baby weight (after having her second child, Jayden James Federline) to get back in shape for her Circus tour? By dancing, of course! She also lifted weights and had rigorous workouts with trainer Kacy Duke. But the media darling admitted mixed feelings about her post-baby body, saying "Recently I started to appreciate my body a bit more from before I had kids. But it completely changed."

Onyx Hotel Tour: May 19, 2004

It's obvious Britney loves her leather, and it’s easy to see why—she's smokin' in it! With costumes like this, it’s no surprise her Onyx Hotel Tour was so commercially successful (it grossed more than $30 million). Prior to the tour, the chart-topping superstar had been sweating up a storm with trainer Bobby Strom, who says, “She's a pro. She knows what to do to get back in shape.”

31st Annual American Music Awards: November 16, 2003

In one of her raciest outfits yet, Britney heated up the stage at the 2003 American Music Awards. The performance was just two days before the release of her fourth studio album, In the Zone, which featured more mature topics like hangovers and even masturbation. But don't be confused by her explicit lyrics or revealing ensembles; the singer has admitted, “Just because I look sexy on the cover of Rolling Stone, doesn't mean I'm naughty."

MTV TRL Performance: November 10, 2003

There's something about a more casual Britney that we adore, but it just wouldn't be her style without a little belly showing! And who wouldn't want to flaunt those rock-hard abs? Says the princess of pop, "I know not everyone will like me, but this is who I am, so if you don't like it… tough!"

NFL Kickoff Live: September 4, 2003

No doubt Britney inspired a myriad of future sexy Halloween costumes in this referee-inspired ensemble. The pop singer kicked off the 2003 NFL opening game with her new single, "Me Against The Music," and surely scored big with the crowd due to her super-fit bod. “I dress the way I want. I don't pretend to be someone I’m not,” the blonde bombshell has said

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2003 MTV Video Music Awards: August 28, 2003

Not only was her costume white hot, so was that triple kiss! Audiences knew they were in for something a little different during Britney's 2003 MTV VMA performance with Christina Aguilera and Madonna, but they definitely didn't expect to see the most epic lip lock of all time—between all three of them! The best part? According to Madge, Brit was a "good kisser."

Nassau Coliseum, Dream Within a Dream Tour: November 7, 2001

Britney kicked off her Dream Within a Dream Tour with hit songs "Toxic" and "Overprotected" in this super-tight, Elvis-inspired jumpsuit that accentuated her athletic figure. There's no denying that when the whole world is watching, you have to be in the best shape possible—and she certainly was!

2001 MTV Video Music Awards: September 7, 2001

It's hard to believe Britney’s sultry and oh-so-memorable performance of "I'm a Slave 4 U" at the 2001 MTV Video Music Awards was more than 10 years ago. Draping herself in a white python and slithering around in a bejeweled bra top and short-shorts, no question the star was in her prime. Creating one of the most striking visuals in the 27-year history of the show, Brit's body was killer—and so was her handling of that snake!

Super Bowl XXXV Performance: January 28, 2001

All eyes were on Britney totally rocking out in this touchdown-worthy ensemble during the halftime show at Super Bowl XXXV. Bringing the biggest names in pop music at the time to share the stage (*Nsync, Aerosmith, Mary J. Blige, and Nelly to name a few), it was one of the most memorable moments in football history.

2000 MTV Video Music Awards: September 7, 2000

The year was 2000 and it was Britney's second time at the VMAs. She'd debuted the previous year, singing a pretty tame version of "Baby One More Time," but in this scenario, she really stepped it up! Starting off her performance in a menswear-inspired pinstriped suit, Brit suddenly tore off her costume to reveal this amazing nude-toned, two-piece bodysuit—and the rest is history.

Grammy Awards: February 25, 2000

Talk about a blast from the past! This sequined bodysuit may be one of the most demure outfits Britney has ever sported on stage, but it's still just as sexy! The blonde beauty, who was just 19 at the time, heated up the Grammy Awards in 2000, where she was nominated for Best New Artist and Best Female Pop Vocal Performance. Even at that age, the chart-topper was cool and confident. "Never doubt yourself. Never change who you are. Don't care what other people think, just go for it."